Log-Euclidean Metric Learning on Symmetric Positive Definite Manifold with Application to Image Set Classification Zhiwu Huang†‡ ZHIWU.HUANG@VIPL.ICT.AC.CN Ruiping Wang†§ WANGRUIPING@ICT.AC.CN Shiguang Shan†§ SGSHAN@ICT.AC.CN Xianqiu Li†‡ XIANQIU.LI@VIPL.ICT.AC.CN Xilin Chen†§ XLCHEN@ICT.AC.CN † Key Laboratory of Intelligent Information Processing of Chinese Academy of Sciences (CAS), Institute of